package org.bouncycastle.asn1.x509;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERSequence;

public class AttributeCertificateInfo extends ASN1Encodable {
    private DERInteger version;
    private Holder holder;
    private AttCertIssuer issuer;
    private AlgorithmIdentifier signature;
    private DERInteger serialNumber;
    private AttCertValidityPeriod attrCertValidityPeriod;
    private ASN1Sequence attributes;
    private DERBitString issuerUniqueID;
    private X509Extensions extensions;

    public static AttributeCertificateInfo getInstance(ASN1TaggedObject obj, boolean explicit) {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    public static AttributeCertificateInfo getInstance(Object obj) {
        if (obj instanceof AttributeCertificateInfo) {
            return (AttributeCertificateInfo) obj;
        } else if (obj instanceof ASN1Sequence) {
            return new AttributeCertificateInfo((ASN1Sequence) obj);
        }

        throw new IllegalArgumentException("unknown object in factory");
    }

    public AttributeCertificateInfo(ASN1Sequence seq) {
        if (seq.size() < 7 || seq.size() > 9) {
            throw new IllegalArgumentException("Bad sequence size: " + seq.size());
        }

        this.version = DERInteger.getInstance(seq.getObjectAt(0));
        this.holder = Holder.getInstance(seq.getObjectAt(1));
        this.issuer = AttCertIssuer.getInstance(seq.getObjectAt(2));
        this.signature = AlgorithmIdentifier.getInstance(seq.getObjectAt(3));
        this.serialNumber = DERInteger.getInstance(seq.getObjectAt(4));
        this.attrCertValidityPeriod = AttCertValidityPeriod.getInstance(seq.getObjectAt(5));
        this.attributes = ASN1Sequence.getInstance(seq.getObjectAt(6));

        for (int i = 7; i < seq.size(); i++) {
            ASN1Encodable obj = (ASN1Encodable) seq.getObjectAt(i);

            if (obj instanceof DERBitString) {
                this.issuerUniqueID = DERBitString.getInstance(seq.getObjectAt(i));
            } else if (obj instanceof ASN1Sequence || obj instanceof X509Extensions) {
                this.extensions = X509Extensions.getInstance(seq.getObjectAt(i));
            }
        }
    }

    public DERInteger getVersion() {
        return version;
    }

    public Holder getHolder() {
        return holder;
    }

    public AttCertIssuer getIssuer() {
        return issuer;
    }

    public AlgorithmIdentifier getSignature() {
        return signature;
    }

    public DERInteger getSerialNumber() {
        return serialNumber;
    }

    public AttCertValidityPeriod getAttrCertValidityPeriod() {
        return attrCertValidityPeriod;
    }

    public ASN1Sequence getAttributes() {
        return attributes;
    }

    public DERBitString getIssuerUniqueID() {
        return issuerUniqueID;
    }

    public X509Extensions getExtensions() {
        return extensions;
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     * 
     * <pre>
     *  AttributeCertificateInfo ::= SEQUENCE {
     *       version              AttCertVersion -- version is v2,
     *       holder               Holder,
     *       issuer               AttCertIssuer,
     *       signature            AlgorithmIdentifier,
     *       serialNumber         CertificateSerialNumber,
     *       attrCertValidityPeriod   AttCertValidityPeriod,
     *       attributes           SEQUENCE OF Attribute,
     *       issuerUniqueID       UniqueIdentifier OPTIONAL,
     *       extensions           Extensions OPTIONAL
     *  }
     * 
     *  AttCertVersion ::= INTEGER { v2(1) }
     * </pre>
     */
    public DERObject toASN1Object() {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(version);
        v.add(holder);
        v.add(issuer);
        v.add(signature);
        v.add(serialNumber);
        v.add(attrCertValidityPeriod);
        v.add(attributes);

        if (issuerUniqueID != null) {
            v.add(issuerUniqueID);
        }

        if (extensions != null) {
            v.add(extensions);
        }

        return new DERSequence(v);
    }
}
